Sensible behavior on iPad

[MattFerraro]

CADmium should work very well on an iPad or comparable Android tablet. It should support finger gestures as well as Apple Pencil and comparable Android products.

This could be handled in phases:

1. Make CADmium render well. Make sure button sizes and gestures are sensible
2. Support Apple Pencil for detailed sketch work
3. Figure out file sharing or syncing across devices, because iPads are almost always accessories to a real laptop somewhere

[av8ta]

Sounds good. I think 3 is a separate issue that can be solved for all devices.

Related to #27

[dzervas]

note: I have an android tablet with proper pen support (Samsung Galaxy S9 FE) and I can test it and I have access to an iPad 10.9 with Apple Pencil